Three-port full bridge converter application as a combined charger for PHEVs

Abstract

The AC charger can be combined with the DCDC converter through the three-port full bridge topology for plug-in hybrid vehicles(PHEVs). During the driving mode, the main battery supplies energy to the 14V system through the DC-DC converter. At this time, the AC charger circuit should be disconnected. Otherwise, power flows in the AC charger circuit, resulting in a high voltage destruction. In this work, a virtual isolation method is proposed that prevents current flowing into the AC charger circuit, while a normal DC-DC converter operation is taking place. To realize the proposed control method, offset phase angles are calculated. A simulation evidence supports the feasibility of the proposed scheme.